Drive method and drive circuit for driving organic light-emitting diode panel and display device

ABSTRACT

Provided are a drive method and drive circuit for an organic light-emitting diode panel and a display device. The method is applied to an organic light-emitting diode panel, which includes a light-emitting layer, and a first light-emitting control electrode layer and a touch electrode layer sequentially on the light-emitting layer. The first light-emitting control electrode layer and the touch electrode layer are insulated from each other. The method includes: outputting a display voltage to the first light-emitting control electrode layer at a display stage and outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No.: 201810844775.5, filed on Jul. 27, 2018 and entitled “ORGANIC LIGHT-EMITTING DIODE PANEL AND DRIVE METHOD THEREOF, AND DISPLAY DEVICE”, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a drive method and a drive circuit for an organic light-emitting diode panel, and a display device.

BACKGROUND

The touch structures of organic light-emitting diode (OLED) panels include out-cell touch structures, touch-on-cell structures, and touch-in-cell structures. In the touch-in-cell structure, the touch structure is designed in the OLED panel.

An OLED panel adopting the touch-in-cell structure is provided in the related art. The OLED panel includes a back plate layer, and a light-emitting layer and a cathode layer disposed on the back plate layer. The back plate layer includes a thin film transistor array, an anode layer and other structures. The back plate layer and the cathode layer are configured to drive the light-emitting layer in the OLED panel to emit light. The cathode layer is divided into a plurality of sub-units and each of the sub-units is reused as a touch unit of the touch structure, simultaneously.

SUMMARY

Embodiments of the present disclosure provide a drive method and a drive circuit for an organic light-emitting diode panel, and a display device.

At least one embodiment of the present disclosure provides a method for driving an OLED panel, applied to an OLED panel, wherein the OLED panel comprises a light-emitting layer, and a first light-emitting control electrode layer and a touch electrode layer sequentially disposed on the light-emitting layer, and the first light-emitting control electrode layer and the touch electrode layer are insulated from each other. The method comprises: outputting a display voltage to the first light-emitting control electrode layer at a display stage; and outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage.

In an implementation of the present disclosure, the shielding voltage is 0V.

In an implementation of the present disclosure, the display voltage is 0V.

In an implementation of the present disclosure, outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage comprises: controlling the first light-emitting control electrode layer to be grounded at the touch stage.

At least one embodiment of the present disclosure provides a drive circuit for an OLED panel, applied to an OLED panel, wherein the OLED panel comprises a light-emitting layer, and a first light-emitting control electrode layer and a touch electrode layer sequentially disposed on the light-emitting layer, and the first light-emitting control electrode layer and the touch electrode layer are insulated from each other. The drive circuit is configured to control the first light-emitting control electrode layer to be applied with a display voltage at a display stage and control the first light-emitting control electrode layer to be applied with a shielding voltage at a touch stage.

In an implementation of the present disclosure, the shielding voltage is 0V.

In an implementation of the present disclosure, the display voltage is 0V.

In an implementation of the present disclosure, the drive circuit is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.

At least one embodiment of the present disclosure provides a display device, comprising an OLED panel and a drive circuit for an OLED panel electrically connected to the OLED panel. The OLED panel comprises a light-emitting layer, and a first light-emitting control electrode layer and a touch electrode layer sequentially disposed on the light-emitting layer, and the first light-emitting control electrode layer and the touch electrode layer are insulated from each other. The drive circuit is configured to output a display voltage to the first light-emitting control electrode layer at a display stage and output a shielding voltage to the first light-emitting control electrode layer at a touch stage.

In an implementation of the present disclosure, the shielding voltage is 0V.

In an implementation of the present disclosure, the display voltage is 0V.

In an implementation of the present disclosure, the drive circuit is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.

In an implementation of the present disclosure, the touch electrode layer comprises a plurality of electrode units distributed at intervals, and each electrode unit is a touch sensing electrode.

In an implementation of the present disclosure, the touch electrode layer comprises a driving electrode layer and a sensing electrode layer which are insulated, and one layer, closer to the first light-emitting control electrode layer, of the driving electrode layer and the sensing electrode layer comprises a plurality of electrode units distributed at intervals.

In an implementation of the present disclosure, the plurality of electrode units is connected to a plurality of touch leads in a one-to-one correspondence; and the plurality of touch leads and the touch electrode layer are arranged in different layers.

In an implementation of the present disclosure, the plurality of touch leads is in the first light-emitting control electrode layer, and is connected to the corresponding electrode units through via holes.

In an implementation of the present disclosure, the first light-emitting control electrode layer comprises a plurality of strip electrodes distributed in parallel at intervals, and each of the plurality of touch leads is at a gap between adjacent strip electrodes.

In an implementation of the present disclosure, the OLED panel is divided into a plurality of sub-pixel regions and each of the electrode units covers a plurality of the sub-pixel regions, and each of the electrode units is of a transparent blocky structure.

In an implementation of the present disclosure, the OLED panel is divided into a plurality of sub-pixel regions, each of the electrode units is a grid-shaped structure; and leads forming the grid-shaped structure are all in regions among the sub-pixel regions.

In an implementation of the present disclosure, a first encapsulation layer is disposed between the first light-emitting control electrode layer and the touch electrode layer, and the first encapsulation layer is a first inorganic encapsulation layer; a second encapsulation layer is further disposed on the touch electrode layer, and the second encapsulation layer comprises an organic encapsulation layer and a second inorganic encapsulation layer laminated on the touch electrode layer.

In an implementation of the present disclosure, the OLED panel is an active-matrix OLED panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram of an OLED panel provided in an embodiment of the present disclosure;

FIG. 2 is a structural schematic diagram of a touch electrode layer when a self-capacitance touch solution is adopted in the embodiment of the present disclosure;

FIG. 3 is a structural schematic diagram of the touch electrode layer when the a mutual-capacitance touch solution is adopted in embodiment of the present disclosure;

FIG. 4 is a structural schematic diagram of a first light-emitting control electrode layer provided in an embodiment of the present disclosure;

FIG. 5 and FIG. 6 are structural schematic diagrams of an electrode unit provided in an embodiment of the present disclosure;

FIG. 7 is a flow chart of a method for driving an OLED panel provided in an embodiment of the present disclosure; and

FIG. 8 is a structural schematic diagram of a drive circuit for an OLED panel provided in an embodiment of the present disclosure.

DETAILED DESCRIPTION

To describe the principle and advantages of the present disclosure more clearly, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

In the related art, the touch unit of the touch structure, during operation, is subject to interference of signals from a thin film transistor array and an anode layer in a back plate layer, which affects the touch precision.

FIG. 1 is a structural schematic diagram of an OLED panel provided in an embodiment of the present disclosure. With reference to FIG. 1, the OLED panel includes a light-emitting layer 101, and a first light-emitting control electrode layer 102 and a touch electrode layer 103 which are sequentially disposed on the light-emitting layer 101. The first light-emitting control electrode layer 102 and the touch electrode layer 103 are insulated from each other. The OLED panel is configured to control, at a display stage, the first light-emitting control electrode layer 102 to be applied with a display voltage, and control, at a touch stage, the touch electrode layer 103 to be applied with a touch voltage and the first light-emitting control electrode layer 102 to be applied with a shielding voltage.

In the embodiments of the present disclosure, the display stage refers to a stage during which the OLED panel display images, and the touch stage refers to a stage in which the OLED panel performs touch sensing. The display stage and the touch stage appear at different time periods and there may be a plurality of display stages and a plurality of touch stages within one second.

In the embodiments of the present disclosure, controlling the first light-emitting control electrode layer 102 to be applied with a shielding voltage may refer to that the voltage of the first light-emitting control electrode layer 102 is controlled to maintain at 0V. When the voltage of the first light-emitting control electrode layer 102 maintains at 0V, the effect of signal shielding may be achieved. Of course, the voltage of the first light-emitting control electrode layer 102 may also maintain at other voltage values that can achieve the effect of signal shielding.

In the embodiments of the present disclosure, the touch electrode layer 103 is disposed above the first light-emitting control electrode layer 102, and the touch electrode layer is controlled to be applied with the touch voltage at the touch stage, to achieve the touch function of the OLED panel. At the touch stage, the first light-emitting control electrode layer 102 is controlled to be applied with the shielding voltage (maintain at 0 V). When being applied with the shielding voltage (maintained at 0 V), the first light-emitting control electrode layer 102 can play the function of signal shielding. Thus, signals from circuits of the lower layer (back plate layer 100) of the OLED panel may be shielded, thereby reducing coupling interference and improving the touch precision.

As shown in FIG. 1, the OLED panel further includes a back plate layer 100, and the light-emitting layer 101 is disposed on the back plate layer 100.

In the embodiments of the present disclosure, a drive circuit is disposed in the OLED panel, and drive control on display and touch is achieved through the drive circuit. The drive circuit may include a touch drive circuit and a display drive circuit. The display drive circuit is configured to drive the back plate layer 100 and the first light-emitting control electrode layer 102 in the OLED panel, to control the OLED panel to emit light for display. The touch drive circuit is configured to drive the touch electrode layer 103, to control the OLED panel to achieve the touch function. The drive circuit may be a drive integrated circuit (IC), thereby facilitating light and thin design of the OLED panel. The touch drive circuit and the display drive circuit may be integrated on the same IC and may also be implemented respectively by adopting two or more ICs.

The OLED panel provided in this implementation of the present disclosure may be an active-matrix organic light-emitting diode (AMOLED) panel and may also be a passive-matrix organic light emitting diode (PMOLED) panel.

When the OLED panel is an AMOLED panel, the back plate layer 100 includes a thin film transistor (TFT) array substrate and a second light-emitting control electrode layer on the TFT array substrate. Since a TFT array substrate is disposed in the back plate of the AMOLED panel, interference on touch sensing is more. Therefore, the touch precision of the AMOLED panel can be improved by adopting such a structure. When the OLED panel is a PMOLED panel, the back plate layer 100 includes a base substrate and a second light-emitting control electrode layer on the base substrate.

In the embodiments of the present disclosure, the first light-emitting control electrode layer 102 may be a cathode and may also be an anode. When the first light-emitting control electrode layer 102 is a cathode, the second light-emitting control electrode layer is an anode. When the first light-emitting control electrode layer 102 is an anode, the second light-emitting control electrode layer is a cathode. Generally, the first light-emitting control electrode layer 102 is a cathode and the second light-emitting control electrode layer is an anode. Exemplarily, the cathode may be made of metal materials such as silver and may also be made of a silver-indium tin oxide-silver (Ag-ITO-Ag) material. The anode may be made of indium tin oxide (ITO), indium zinc oxide (IZO) or the like and may also be made of an alloy of magnesium and silver.

Exemplarily, the TFT array substrate may include a base substrate and a plurality of TFTs disposed in an array on the base substrate. The TFT includes a gate, a gate insulating layer, an active layer, a source/drain, and a passivation layer, etc., which are sequentially laminated on the base substrate. The base substrate may be a glass substrate, a silicon substrate and the like. The gate and the source/drain may be metal layers, such as aluminum layers, copper layers, molybdenum layers, titanium layers and chromium metal layer, etc., and may also be metal laminated layers, such as laminated layers made of aluminum, chromium and the like. Both the gate insulating layer and the passivation layer are insulating layers, and the insulating layers may specifically be silicon nitride or silicon oxynitride layers. The active layer may be made of amorphous silicon, microcrystalline silicon or polycrystalline silicon. For example, the active layer may include an amorphous silicon layer disposed on the gate insulating layer and an N-type doped amorphous silicon layer disposed on the amorphous silicon layer. The above TFT is a bottom-gate type TFT. Of course, in the present disclosure, the TFT may also be a top-gate type TFT or double-gate TFT, which is not limited in the present disclosure.

Exemplarily, in order to facilitate manufacture of the first light-emitting control electrode layer, the light-emitting layer and other structures, the back plate layer 100 further includes a pixel defining layer. The pixel defining layer is configured to define a plurality of sub-pixel regions on the back plate layer 100, and each of the first light-emitting control electrode layer and the light-emitting layer includes a plurality of structure units corresponding to the sub-pixel regions.

In the embodiments of the present disclosure, the light-emitting layer 101 includes, but is not limited to: a hole injection sub-layer, a hole transport sub-layer, an organic light-emitting sub-layer, an electron transport sub-layer and an electron injection sub-layer which are sequentially arranged. Optionally, the organic light-emitting layer includes a red organic light-emitting layer, a green organic light-emitting layer and a blue organic light-emitting layer.

In the embodiments of the present disclosure, the OLED panel may adopt self-capacitance and mutual-capacitance touch solutions.

When the OLED panel adopts the self-capacitance touch solution, the touch electrode layer 103 includes a plurality of electrode units arranged at intervals, and each electrode unit is a touch sensing electrode.

FIG. 2 is a structural schematic diagram of a touch electrode layer when a self-capacitance touch solution is adopted. With reference to FIG. 2, the touch electrode layer 103 includes a plurality of electrode units 131 disposed at intervals. Here, the electrode unit 131 is a touch sensing electrode unit.

When the OLED panel adopts the mutual-capacitance touch solution, the touch electrode layer 103 includes a driving electrode layer and a sensing electrode layer which are insulated. The layer, closer to the first light-emitting control electrode layer 102, of the driving electrode layer and the sensing electrode layer includes a plurality of electrode units disposed at intervals.

FIG. 3 is a structural schematic diagram of a touch electrode layer when a mutual-capacitance touch solution is adopted. With reference to FIG. 3, the touch electrode layer 103 includes a driving electrode layer 1031 and a sensing electrode layer 1032 which are insulated. The driving electrode layer 1031 closer to the first light-emitting control electrode layer 102 includes a plurality of electrode units 131 disposed at intervals. The sensing electrode layer 1032 also includes a plurality of electrode units 132. In other implementations, the sensing electrode layer 1032 may be disposed closer to the first light-emitting control electrode layer 102, which is not limited in the present disclosure.

Here, one of the electrode unit 131 and the electrode unit 132 is a touch electrode unit and the other is a sensing electrode unit.

As shown in FIG. 3, both the electrode units 131 and the electrode units 132 are strip-shaped and the electrode units 131 and the electrode units 132 are vertically intersect with each other. The electrode unit 131 and the electrode unit 132 may be designed in the same way. For example, the electrode unit 131 and the electrode unit 132 may adopt the same structure, the same connection (connection to the drive circuit) or the like. The same connection means that both the electrode unit 131 and the electrode unit 132 are connected to the drive circuit through via holes and leads, and the leads may be disposed in the same layer.

In the mutual-capacitance touch solution shown in FIG. 3, the electrode unit 131 and the electrode unit 132 may be insulated by disposing an insulating layer.

In other embodiments, the same-layer design may be adopted in the mutual-capacitance touch solution.

In the two touch solutions, the structures (except for the shape) and the connection with the driving circuit of all electrode units 131 may be the same. The foregoing electrode unit 131 is described below by taking the structure of the electrode unit 131 in the self-capacitance touch solution as an example.

In the implementation of the present disclosure, the drive circuit is connected to the plurality of electrode units 131 through a plurality of touch leads in a one-to-one correspondence. That is, the plurality of electrode units 131 is connected to the plurality of touch leads in a one-to-one correspondence. The drive circuit controls one electrode unit 131 through one lead. The plurality of touch leads and the touch electrode layer 103 are disposed at different layers.

In this implementation, the touch leads and the touch electrode layer are arranged at different layers, to avoid the touch leads from occupying the area of the layer where the electrode units are, thereby eliminating a touch blind region caused by arranging the touch leads and the touch electrode layer in the same layer, and improving the touch precision.

With reference to FIG. 1, in an implementation of the present disclosure, the plurality of touch leads 104 is disposed in the first light-emitting touch electrode layer 102. That is, the first light-emitting touch electrode layer 102 and the plurality of touch leads 104 are disposed in the same layer. The plurality of touch leads 104 is connected to the corresponding electrode units 131 through via holes 140 respectively. As described above, the first light-emitting control electrode layer 102 and the touch electrode layer 103 are insulated. That is, an insulating film layer is disposed between the first light-emitting control electrode layer 102 and the touch electrode layer 103. Hence, in order to connect the touch leads 104 with the electrode units 131, via holes 140 need to be set in the insulating film layer between the first light-emitting control electrode layer 102 and the touch electrode layer 103.

The touch leads 104 are disposed in the first light-emitting control electrode layer 102 and the leads do not need to be disposed in a layer individually, which reduces the cost and the thickness of the panel, meanwhile reduces the number of times of the patterning process adopted during manufacture of the panel.

FIG. 4 is a structural schematic diagram of a first light-emitting control electrode layer provided in an embodiment of the present disclosure. With reference to FIG. 4, the first light-emitting control electrode layer 102 includes a plurality of strip electrodes 121 which are distributed in parallel at intervals, and each of the plurality of touch leads 104 is disposed at a gap between adjacent strip electrodes 121. The first light-emitting control electrode layer 102 is divided into a plurality of strip electrodes, which can guarantee the normal wiring of the touch leads 104, thereby achieve the arrangement of the first light-emitting touch electrode layer 102 and the touch leads 104 in the same layer.

The strip electrodes 121 may be linear strip electrodes shown in the drawing and may also be other strip electrodes, such as zig-zag strip electrodes and arc strip electrodes.

As shown in FIG. 4, in an implementation of the present disclosure, one ends of the plurality of strip electrodes 121 are connected together through a lead 122.

In this implementation, the first light-emitting control electrode layer 102 is a cathode layer. The cathode voltages applied to the whole cathode layer are the same. Hence, in order to connect the lead and the drive circuit and facilitate the control of the plurality of strip electrodes 121 in FIG. 4 by the drive circuit, the plurality of strip electrodes 121 may be connected together through the lead 122, thereby facilitating drive of the first light-emitting control electrode layer 102 by the drive circuit. Of course, in other embodiments, each of the strip electrodes 121 may also be electrically connected to the drive circuit separately.

Exemplarily, the OLED panel includes a display region and a peripheral region. The peripheral region surrounds the display region and the lead 122 mentioned above is disposed in the peripheral region of the OLED panel.

In an implementation of the present disclosure, the OLED panel is divided into a plurality of sub-pixel regions and each touch lead 104 is disposed between the adjacent sub-pixel regions.

In the display panel, there is certain gap between the adjacent sub-pixel regions. This gap is a non-sub-pixel region. By arranging the touch lead 104 in the non-sub-pixel region, the situation that the touch leads shield the sub-pixel region to affect light emission from pixels of the OLED panel is avoided.

In an implementation of the present disclosure, each electrode unit 131 covers a plurality of sub-pixel regions and each electrode unit 131 is of a transparent blocky structure.

In this implementation, the electrode unit 131 is made of a transparent conductive material, such as indium tin oxide (ITO), indium zinc oxide (IGO) or the like.

By adopting this design, the area of the electrode unit is guaranteed on the premise of guaranteeing the touch precision, and difficulty in manufacture caused by a too small area of the electrode unit is avoided. By adopting the electrode unit of the transparent blocky structure, the situation that the touch electrode layer 103 shields the sub-pixel regions of the OLED to affect the display effect is avoided.

FIG. 5 and FIG. 6 are structural schematic diagrams of another electrode unit provided in an embodiment of the present disclosure. With reference to FIG. 5 and FIG. 6, each electrode unit 131 is of a grid-shaped structure. Each electrode unit 131 of the grid-shaped structure includes a plurality of leads 1310 of the grid-shaped structure, and each lead 1310 of the grid-shaped structure is in a region between the sub-pixel regions. As shown in FIG. 5, the electrode unit 131 includes a plurality of transverse leads 1310 and a plurality of longitudinal leads 1310, and the plurality of transverse leads 1310 and the plurality of longitudinal leads 1310 together form the electrode unit 131. As shown in FIG. 6, the electrode unit 131 is of a honeycomb structure. The electrode unit 131 of the honeycomb structure includes bent leads 1310 in varied directions, and these bent leads 1310 together form the electrode unit 131.

By adopting this design, the area of the electrode unit is guaranteed on the premise of guaranteeing the touch precision, and difficulty in manufacture caused by a too small area of the electrode unit is avoided. By adopting the electrode unit of the grid-shaped structure, since the leads are all in the regions between the sub-pixel regions, the situation that the touch electrode layer 103 shields the sub-pixel regions of the OLED to affect the display effect is avoided.

In this implementation, the electrode unit 131 may be made of a transparent conductive material, such as indium tin oxide (ITO) or indium zinc oxide (IGO), and may also be made of a non-transparent conductive material, such as aluminum, molybdenum, neodymium, silver and other metal.

As shown in FIG. 5 and FIG. 6, the outer contour of the electrode unit 131 may be rectangular. In other implementations, the outer contour of the electrode unit 131 may also be in other shapes, such as a hexagon.

In the structures shown in FIG. 5 and FIG. 6, the grid in the electrode unit 131 may be rectangular (as shown in FIG. 5) and may also be hexagonal (as shown in FIG. 6). The shape of the grid herein may be related to the shape of the sub-pixel region. If the sub-pixel region is rectangular, the grid is rectangular. If the sub-pixel region is hexagonal, the grid is hexagonal. If the sub-pixel region is in other shapes, the grid is in other shapes. Of course, in other embodiments, the shape of the grid may also be designed based on demands, without considering the shape of the sub-pixel region.

With reference to FIG. 1 again, a first encapsulation layer 105 is disposed between the first light-emitting control electrode layer 102 and the touch electrode layer 103, and the first encapsulation layer 105 is a first inorganic encapsulation layer. A second encapsulation layer 106 is also disposed on the touch electrode layer 103. The second encapsulation layer includes an organic encapsulation layer 161 and a second inorganic encapsulation layer 162 which are laminated on the touch electrode layer 103.

Since the whole panel is encapsulated by three layers, i.e., the inorganic layer, the organic layer and the inorganic layer, the waterproof effect of the OLED panel is guaranteed. Meanwhile, since the touch electrode layer 103 is disposed between the two encapsulation layers, shielding of signals below may be further enhanced. In addition, water vapor is also prevented from affecting the touch electrode layer 103 since there are two encapsulation layers above the touch electrode layer 103.

Here, the inorganic encapsulation layer may be made of at least one of silicon oxide, silicon nitride, and silicon oxynitride, etc. The organic encapsulation layer may be made of at least one of polyimide (PI), polyamide (PA), acrylic resin, benzocyclobutene (BCB), and phenol resin, etc.

In other implementations, the touch electrode layer 103 may also be disposed between the organic encapsulation layer 161 and the second inorganic encapsulation layer 162.

In other embodiments, the OLED panel may also only include two encapsulation layers. For example, the OLED panel only includes one inorganic encapsulation layer and one organic encapsulation layer, and the touch electrode layer 103 is disposed between the inorganic encapsulation layer and the organic encapsulation layer.

FIG. 7 is a flow chart of a method for driving an OLED panel provided in an embodiment of the present disclosure. The method is applied to the OLED panel as shown in FIG. 1. With reference to FIG. 7, the method includes the following steps.

In step 201, a first light-emitting control electrode layer is controlled to be applied with a display voltage at a display stage. That is, the display voltage is output to the first light-emitting control electrode layer.

Optionally, when the first light-emitting control electrode layer is a cathode layer, a drive unit applies a cathode voltage to the first light-emitting control electrode layer. When the first light-emitting control electrode layer is an anode layer, the first light-emitting control electrode layer is divided into a plurality of anode units, and the drive unit applies corresponding anode voltages to the anode units respectively at the display stage.

At the display stage, the touch electrode layer does not operate and therefore does not need to be applied with a touch voltage.

In step 202, the first light-emitting control electrode layer is controlled to be applied with a shielding voltage at a touch stage. That is, the shielding voltage is output to the first light-emitting control electrode layer.

At the touch stage, the touch electrode layer operates and the touch electrode layer is controlled to be applied with the touch voltage. That is, touch voltage is output to the touch electrode layer.

Optionally, the shielding voltage may be 0V. Controlling the first light-emitting control electrode layer to be applied with the shielding voltage may include: controlling the voltage of the first light-emitting control electrode layer is controlled to maintain at 0V. When the voltage of the first light-emitting control electrode layer maintains at 0V, the effect of signal shielding can be achieved. Of course, the shielding voltage may also be at other voltage values that can enable the first light-emitting control electrode to achieve the effect of signal shielding.

Here, controlling the voltage of the first light-emitting control electrode layer to maintain at 0V may be to control the first light-emitting control electrode layer to be grounded, to enable the voltage of the control electrode layer to maintain at 0V.

Optionally, the display voltage may be 0V. In this case, the first light-emitting control electrode layer is usually a cathode, and the cathode voltage in a conventional OLED panel is a negative voltage. When the cathode voltage is adjusted to 0V, the voltage of the second light-emitting control layer (anode) in the OLED panel needs to be adjusted at the same time. For example, the anode voltage is increased, to guarantee the voltage difference between the anode and the cathode, thereby guaranteeing normal display of the OLED panel. By designing both the display voltage and the shielding voltage to 0V, it can guarantee that the first light-emitting control electrode layer can play the functions of display and shielding at different stages, and the voltage output to the first light-emitting control electrode layer does not need to be switched. Therefore, convenience in control is achieved and the circuit design is simpler. In this case, outputting the display voltage to the first light-emitting control electrode layer may be to control the first light-emitting control electrode layer to be grounded.

When the shielding voltage≠the display voltage, the first light-emitting control electrode layer is controlled to be connected to a display voltage output sub-circuit at the display stage. For example, when the first light-emitting control electrode layer is a cathode layer, the first light-emitting control electrode layer is controlled to be connected to a cathode voltage output sub-circuit in the drive circuit; and when the first light-emitting control electrode layer is an anode layer, the first light-emitting control electrode layer is controlled to be connected to an anode voltage output sub-circuit in the drive circuit.

Optionally, in case where the self-capacitance touch solution is adopted, touch voltage is applied to respective electrode units in the touch electrode layer firstly and then it is determined whether positions corresponding to respective electrode units are touched through sensing change in voltages. In case where the self-capacitance touch solution is adopted, touch voltage is applied to respective electrode units in the driving electrode layer firstly and then it is determined whether positions corresponding to respective electrode units are touched through the electrical signals sensed by the sensing electrode layer.

In the above touch process, the voltage of the first light-emitting control electrode layer is controlled to maintain at 0V, to prevent coupling interference between the electrical signals in the back plate layer below and the electrical signals in the touch electrode layer.

In the embodiments of the present disclosure, the touch electrode layer 103 is disposed above the first light-emitting control electrode layer 102, and the touch electrode layer is controlled to be applied with the touch voltage at the touch stage, thereby achieving the touch function of the OLED panel. At the touch stage, the first light-emitting control electrode layer 102 is controlled to be applied with the shielding voltage (maintain at 0V). When being applied with the shielding voltage (maintained at 0 V), the first light-emitting control electrode layer 102 can achieve the function of signal shielding, and can shield signals from circuits in the lower layer (back plate layer 100) of the OLED panel, thereby reducing coupling interference and improving the touch precision.

FIG. 8 is a structural schematic diagram of a drive circuit for an OLED panel provided an embodiment of the present disclosure. With reference to FIG. 8, the drive circuit 10 is electrically connected to an OLED panel 20, which is the OLED panel as shown in FIG. 1.

The drive circuit 10 is configured to control the first light-emitting control electrode layer to be applied with a display voltage at a display stage and to control the first light-emitting control electrode layer to be applied with a shielding voltage at a touch stage.

In an implementation of the present disclosure, the shielding voltage may be 0V. When the voltage of the first light-emitting control electrode layer maintains at 0V, the function of signal shielding can be achieved. Of course, the shielding voltage may also be other voltage values that can enable the first light-emitting control electrode to achieve the function of signal shielding.

In an implementation of the present disclosure, the display voltage may be 0V. In this case, the first light-emitting control electrode layer is usually a cathode, and the cathode voltage in a conventional OLED panel is a negative voltage. When the cathode voltage is adjusted to 0V, the voltage of the second light-emitting control layer (anode) in the OLED panel needs to be adjusted at the same time. For example, the anode voltage is increased, to guarantee the voltage difference between the anode and the cathode, thereby guaranteeing the normal display of the OLED panel. By designing both the display voltage and the shielding voltage to 0V, it can guarantee that the first light-emitting control electrode layer can achieve the functions of display and shielding at different stages, and the voltage output to the first light-emitting control electrode layer does not need to be switched. Therefore, convenience in control is achieved and the circuit design is simpler.

In an implementation of the present disclosure, the drive circuit 10 is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.

Exemplarily, when the shielding voltage=the display voltage=0V, the first light-emitting control electrode layer in the drive circuit 10 may be directly grounded. When the shielding voltage the display voltage, the drive circuit 10 may include a selection sub-circuit. The selection sub-circuit is configured to control the first light-emitting control electrode layer to be connected to a display voltage output sub-circuit at the display stage. For example, the selection sub-circuit is configured to control the first light-emitting control electrode layer to be connected to a cathode voltage output sub-circuit in the drive circuit 10 when the first light-emitting control electrode layer is a cathode layer, and to control the first light-emitting control electrode layer to be connected to an anode voltage output sub-circuit in the drive circuit 10 when the first light-emitting control electrode layer is an anode layer. The selection sub-circuit is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.

Exemplarily, the selection sub-circuit may be a selection switch. Two input terminals of the selection switch are connected to an output sub-circuit and grounded, respectively. The output terminal of the selection switch is connected to the first light-emitting control electrode layer. The control terminal of the selection switch is connected to an integrated circuit (IC) in the drive circuit, and a timing sequence signal capable of characterizing the current stage (display stage/touch stage) is provided to the selection switch by the IC, such that the selection switch can achieve switch between the display voltage and the shielding voltage according to the timing sequence signal.

An embodiment of the present disclosure further provides a display device. The display device includes the OLED panel and the drive circuit for the OLED panel connected to the OLED panel as described above.

During specific implementation, the display device provided in the embodiment of the present disclosure may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame and a navigator.

In the embodiment of the present disclosure, the touch electrode layer 103 is disposed above the first light-emitting control electrode layer 102, and the touch electrode layer is controlled to be applied with the touch voltage at the touch stage, thereby achieving the touch function of the OLED panel. At the touch stage, the first light-emitting control electrode layer 102 is controlled to be applied with the shielding voltage (maintain at 0V). When being applied with the shielding voltage (maintained at 0 V), the first light-emitting control electrode layer 102 can achieve the function of signal shielding, and can shield signals from the circuits in the lower layer (back plate layer 100) of the OLED panel, thereby reducing coupling interference and improving the touch precision.

The above description is merely exemplarily embodiments of the present disclosure, and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present disclosure should be included within the protection scope of the present disclosure. 

What is claimed is:
 1. A method for driving an organic light-emitting diode panel, applied to an organic light-emitting diode panel, wherein the organic light-emitting diode panel comprises a light-emitting layer, a first light-emitting control electrode layer on the light-emitting layer, and a touch electrode layer on the first light-emitting control electrode layer, the first light-emitting control electrode layer and the touch electrode layer are insulated from each other, and the method comprises: outputting a display voltage to the first light-emitting control electrode layer at a display stage; and outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage.
 2. The method according to claim 1, wherein the shielding voltage is 0V.
 3. The method according to claim 2, wherein the display voltage is 0V.
 4. The method according to claim 1, wherein outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage comprises: controlling the first light-emitting control electrode layer to be grounded at the touch stage.
 5. A drive circuit for an organic light-emitting diode panel, applied to an organic light-emitting diode panel, wherein the organic light-emitting diode panel comprises a light-emitting layer, a first light-emitting control electrode layer on the light-emitting layer, and a touch electrode layer on the first light-emitting control electrode layer, the first light-emitting control electrode layer and the touch electrode layer are insulated from each other, and the drive circuit is configured to output a display voltage to the first light-emitting control electrode layer at a display stage and output a shielding voltage to the first light-emitting control electrode layer at a touch stage.
 6. The drive circuit according to claim 5, wherein the shielding voltage is 0V.
 7. The drive circuit according to claim 6, wherein the display voltage is 0V.
 8. The drive circuit according to claim 5, wherein the drive circuit is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.
 9. A display device, comprising an organic light-emitting diode panel and a drive circuit for an organic light-emitting diode panel electrically connected to the organic light-emitting diode panel; wherein the organic light-emitting diode panel comprises a light-emitting layer, a first light-emitting control electrode layer on the light-emitting layer, and a touch electrode layer on the first light-emitting control electrode layer, the first light-emitting control electrode layer and the touch electrode layer are insulated from each other, and the drive circuit is configured to output a display voltage to the first light-emitting control electrode layer at a display stage and output a shielding voltage to the first light-emitting control electrode layer at a touch stage.
 10. The display device according to claim 9, wherein the shielding voltage is 0V.
 11. The display device according to claim 10, wherein the display voltage is 0V.
 12. The display device according to claim 9, wherein the drive circuit is configured to control the first light-emitting control electrode layer to be grounded at the touch stage.
 13. The display device according to claim 9, wherein the touch electrode layer adopts one of the following two structures: the touch electrode layer comprises a plurality of electrode units distributed at intervals, and each electrode unit is a touch sensing electrode; and the touch electrode layer comprises a driving electrode layer and a sensing electrode layer which are insulated, and one layer, closer to the first light-emitting control electrode layer, of the driving electrode layer and the sensing electrode layer comprises a plurality of electrode units distributed at intervals.
 14. The display device according to claim 13, wherein the plurality of electrode units is connected to a plurality of touch leads in a one-to-one correspondence; and the plurality of touch leads and the touch electrode layer are arranged in different layers.
 15. The display device according to claim 14, wherein the plurality of touch leads is in the first light-emitting control electrode layer, and is connected to the corresponding electrode units through via holes.
 16. The display device according to claim 15, wherein the first light-emitting control electrode layer comprises a plurality of strip electrodes distributed in parallel at intervals, and each of the plurality of touch leads is at a gap between adjacent strip electrodes.
 17. The display device according to claim 13, wherein the organic light-emitting diode panel is divided into a plurality of sub-pixel regions and each of the electrode units covers a plurality of the sub-pixel regions, and each of the electrode units is of a transparent blocky structure.
 18. The display device according to claim 13, wherein the organic light-emitting diode panel is divided into a plurality of sub-pixel regions, each of the electrode units is a grid-shaped structure; and leads forming the grid-shaped structure are all in regions among the plurality of sub-pixel regions.
 19. The display device according to claim 9, wherein a first encapsulation layer is between the first light-emitting control electrode layer and the touch electrode layer, and the first encapsulation layer is a first inorganic encapsulation layer; a second encapsulation layer is further on the touch electrode layer, and the second encapsulation layer comprises an organic encapsulation layer and a second inorganic encapsulation layer laminated on the touch electrode layer.
 20. The display device according to claim 9, wherein the organic light-emitting diode panel is an active-matrix organic light-emitting diode panel. 